Source code of Windows XP (NT5)
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

297 lines
6.3 KiB

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "windows.h"
#define BIGREAD 256000
unsigned char readbuff[BIGREAD];
int __cdecl main(int argc,char *argv[]) {
HANDLE hFile;
DCB MyDcb;
char *MyPort = "COM1";
DWORD NumberActuallyRead;
DWORD NumberToRead = 0;
DWORD UseBaud = 19200;
COMMTIMEOUTS To;
COMMPROP MyCommProp;
DWORD numberReadSoFar;
DWORD TotalCount;
DWORD j;
if (argc > 1) {
sscanf(argv[1],"%d",&NumberToRead);
if (argc > 2) {
sscanf(argv[2],"%d",&UseBaud);
if (argc > 3) {
MyPort = argv[3];
}
}
}
printf("Will try to read %d characters.\n",NumberToRead);
printf("Will try to read a %d baud.\n",UseBaud);
printf("Using port %s\n",MyPort);
if ((hFile = CreateFile(
MyPort,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL
)) == ((HANDLE)-1)) {
printf("Couldn't open the port - last error is: %d\n",GetLastError());
exit(1);
}
printf("We successfully opened the %s port.\n",MyPort);
To.ReadIntervalTimeout = 0;
To.ReadTotalTimeoutMultiplier = ((1000+(((UseBaud+9)/10)-1))/((UseBaud+9)/10));
if (!To.ReadTotalTimeoutMultiplier) {
To.ReadTotalTimeoutMultiplier = 1;
}
printf("Multiplier is: %d\n",To.ReadTotalTimeoutMultiplier);
To.ReadTotalTimeoutConstant = 5000;
To.WriteTotalTimeoutMultiplier = 0;
To.WriteTotalTimeoutConstant = 5000;
if (!SetCommTimeouts(
hFile,
&To
)) {
printf("Couldn't set the timeouts - last error: %d\n",GetLastError());
exit(1);
}
//
// We've successfully opened the file. Set the state of
// the comm device. First we get the old values and
// adjust to our own.
//
if (!GetCommState(
hFile,
&MyDcb
)) {
printf("Couldn't get the comm state: %d\n",GetLastError());
exit(1);
}
if (!GetCommProperties(
hFile,
&MyCommProp
)) {
printf("Couldn't get the comm prop: %d\n",GetLastError());
exit(1);
}
//
// Set the Xoff/xon limit so that it lowers the handshake
// whenever we have more than 50 chars in our buffer,
// and raises when we drop below 20.
//
MyDcb.XoffLim = MyCommProp.dwCurrentRxQueue - 50;
MyDcb.XonLim = 20;
MyDcb.BaudRate = UseBaud;
MyDcb.ByteSize = 8;
MyDcb.Parity = NOPARITY;
MyDcb.StopBits = ONESTOPBIT;
//
// Make sure that the only flow control is input RTS.
//
MyDcb.fOutxDsrFlow = FALSE;
MyDcb.fOutxCtsFlow = FALSE;
MyDcb.fDsrSensitivity = FALSE;
MyDcb.fOutX = FALSE;
MyDcb.fInX = FALSE;
MyDcb.fDtrControl = DTR_CONTROL_DISABLE;
MyDcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
if (!SetCommState(
hFile,
&MyDcb
)) {
printf("Couldn't set the comm state - last error: %d\n",GetLastError());
exit(1);
}
//
// Read ten chars at a time until we get all the
// chars or we get some kind of error.
// We delay 100ms after each read to let the buffer
// have a chance to fill up some.
//
for (
numberReadSoFar = 0;
numberReadSoFar < NumberToRead;
) {
if (ReadFile(
hFile,
&readbuff[numberReadSoFar],
10,
&NumberActuallyRead,
NULL
)) {
//
// If there was no characters (timed out), then
// we probably won't see anything.
//
if (!NumberActuallyRead) {
printf("No chars - Timeout!\n");
break;
}
numberReadSoFar += NumberActuallyRead;
Sleep(100);
continue;
} else {
//
// Some kind of read error.
//
DWORD LastError;
LastError = GetLastError();
printf("Couldn't read the %s device.\n",MyPort);
printf("Status of failed read is: %d\n",LastError);
//
// Get the error word from clear comm error.
//
if (!ClearCommError(
hFile,
&LastError,
NULL
)) {
printf("Couldn't call clear comm error: %d\n",GetLastError());
exit(1);
} else {
if (!LastError) {
printf("No LastError\n");
} else {
if (LastError & CE_RXOVER) {
printf("Error: CE_RXOVER\n");
}
if (LastError & CE_OVERRUN) {
printf("Error: CE_OVERRUN\n");
}
if (LastError & CE_RXPARITY) {
printf("Error: CE_RXPARITY\n");
}
if (LastError & CE_FRAME) {
printf("Error: CE_FRAME\n");
}
if (LastError & CE_BREAK) {
printf("Error: CE_BREAK\n");
}
if (LastError & ~(CE_RXOVER |
CE_OVERRUN |
CE_RXPARITY |
CE_FRAME |
CE_BREAK)) {
printf("Unknown errors: %x\n",LastError);
}
}
}
exit(1);
}
}
for (
TotalCount = 0;
TotalCount < numberReadSoFar;
) {
for (
j = 0;
j <= 9;
j++
) {
if (readbuff[TotalCount] != j) {
printf("Bad data starting at: %d\n",TotalCount);
goto donewithcheck;
}
TotalCount++;
if (TotalCount >= numberReadSoFar) {
break;
}
}
}
donewithcheck:;
exit(1);
}